[Bob Bidonde]

My guess is that the hinge pin diameter in your car is 0.250". Drill the mirror bracket the same diameter as the door hinge pin. Use a hex head bolt, hex nut and lock washer in lieu of the hinge pin. Dress the bolt up with chrome nut covers.

The set screws in the mirror bracket make the mirror rotate with the door, so they are essential. I drilled and tapped the door hinge to receive the set screws.

The pictures are of my Victoria which has two hinges per door. Your car has three hinges per door.